He is already using without the S. Since the website uses SSL you need https to not be "mixed content", unfortunately, the parser doesnt work if you use https, only http. Its an easy change to the parser. I dont know if it uses xml tree or regex but shouldnt take more than a minute to figure out.

damn there used to be a way to post videos just by pasting url and manually confirming the protocol of url, if I had to guess, google has changed something in youtube side lol

Thats not something done on Youtube side of things. That has to do with this site and its parser. Youtube never even get to see there's a link to it in here.

Now, if you tell me, there used to be a parser rule to converter https?:\/\/(www\.)*youtube.... (or something like that) into embed/iframe, its very plausible. Then again, nothing to do with any Youtube policy.

Thats not something done on Youtube side of things. That has to do with this site and its parser. Youtube never even get to see there's a link to it in here.

Now, if you tell me, there used to be a parser rule to converter https?:\/\/(www\.)*youtube.... (or something like that) into embed/iframe, its very plausible. Then again, nothing to do with any Youtube policy.

There used to be a way to automatically embed youtube videos just by pasting straight http:// url. Ofc youtube side would never know about random links shared over here, but there was some sort of script that found a youtube link from post and made a flash video out of it. It wouldn't be the first time and wont be the last time either where plugins works incorrectly at websites after 3rd party changes, those plugins needs to be updated to adapt new methods. That's why I'd guess something has changed in embedding flash content in youtube side rather than someone turning this feature off at forum or someone breaking the script.